This is a re-release of an episode that originally aired on July 29, 2018. The stars aligned for me (Katie) this past weekend: I raced my first half-marathon in a long time and got to read a great article from the NY Times about a new running shoe that Nike claims can make its wearers run faster. Causal claims like this one are really tough to verify, because even if the data suggests that people wearing the shoe are faster that might be because of correlation, not causation, so I loved reading this article that went through an analysis of thousands of runners' data in 4 different ways. Each way has a great explanation with pros and cons (as well as results, of course), so be sure to read the article after you check out this episode! Relevant links: vaporfly-shoe-strava.html">https://www.nytimes.com/interactive/2018/07/18/upshot/nike-vaporfly-shoe-strava.html